<!DOCTYPE html>
<html>
<head lang="en">
    <meta charset="UTF-8">
    <title></title>
</head>
<body>
<div id="app">
    <!-- my app renders here -->
</div>
</body>
</html>
<script src="js/react.min.js"></script>
<script src="js/react-dom.min.js"></script>
<script src="js/browser.js"></script>
<script type="text/babel">
  ReactDOM.render(
        <h1 id="my-heading">
          <span><em>Hell</em>o</span> world!
        </h1>,
        document.getElementById('app')
      );
</script>